[PATCH] Boot-time entering prompt by typing "123" sequence rather than any button

[Attilio Rao]

This patch adds the possibility to enter the prompt at boot time by
typing the sequence of buttons "123" rather than a single button:
http://www.freebsd.org/~attilio/Sandvine/STABLE_8/boot123/boot123.diff

This is useful in the cases where a serial console is likely going to
be used which can carry on spourious character, leding to the prompt
erroneously.
This option is wrappered into the BOOT_PROMPT_123 option, in order to
maintain the current POLA.
This patch has been contributed back by Sandvine Incorporated.
Please review.

Thanks,
Attilio


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